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  • Electronic Resource  (3)
  • 1975-1979  (3)
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  • Electronic Resource  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Occurrence and biological role of light-induced chromatophore displacements in seaweeds (1979)
    Springer
    Marine biology 51 (1979), S. 77-82 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The occurrence of light-induced chromatophore displacements and concomitant transmittance changes in marine algae was investigated by microscope and photometrically with an automated recording microphotometer system; 16 brown, 6 green and 20 red algae were studied. In most of the brown algae, both phaeoplast displacements and transmittance changes were found. In some red algae which are frequently exposed to direct sun light during emergence at low tide, light-induced transmittance changes were measured, but they could not unequivocally be correlated with changes in the position of rhodoplasts. Among green algae, only Ulva lactuca shows chloroplast displacements which, however, follow circadian rhythms and are consequently not light-induced in the strict sense. The dose-response curves of light-induced chromatophore displacements were measured in the following Fucus and Laminaria species: F. spiralis, F. vesiculosus, F. serratus, L. digitata, L. saccharina and L. hyperborea. While in Fucus species correlations between light-induced transmittance changes and zonation of the intertidal area seem to exist, no significant differences have been found in the Laminaria species. The physiological role and ecological importance of light-induced chromatophore displacements for seaweeds living in the intertidal belt are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00389033
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Chromatophorenanordnungen in emersen Thalli vonFucus vesiculosus unter verschiedenen Lichtbedingungen (1979)
    Springer
    Helgoland marine research 32 (1979), S. 228-238 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of light and darkness on chromatophore arrangements inFucus vesiculosus thalli exposed to air with one side (half dry) or with both sides (dry) were investigated. Low-intensity arrangement, high-intensity arrangement and dark arrangement were induced in submerged thalli. Then the thalli were exposed to air while light conditions were either kept constant or were changed. Independently of the light conditions, in all thalli exposed to air the chromatophores arranged more or less in the inner area of the cells, in epidermal cells as well as in cortical cells. Thus the chromatophore arrangements observed in submerged thalli differ in some respect from those exposed to low-tide conditions. Based on these observations the physiological and ecological role of chromatophore displacements in seaweeds is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02189899
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Untersuchungen zur lichtinduzierten Chromatophorenverlagerung beiFucus vesiculosus (1978)
    Springer
    Helgoland marine research 31 (1978), S. 333-346 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Light-induced transmission changes, measured microphotometrically in the brown algaFucus vesiculosus, are mainly the result of chromatophore displacements. Dose-response curves, as well as observations by microscope, have shown that the typical low-intensity arrangement occurs at 1 000 lux and the complete high intensity arrangement at 20 000 lux. The arrangements of the chromatophores — as well as their shapes — in dim light, strong light and darkness have been investigated. The chromatophore arrangements are different in the epidermal, cortical and medullary cells. In dim light the chromatophores are relatively large. The chromatophores of the epidermis are placed in the plasma layer of the inner cell halves. In the cortical and medullary cells the chromatophores occupy mainly the cell walls facing the light. In strong light the chromatophores are shorter and tend to become spherical. In the epidermis facing the light they move into the basal part of the cells, in the cortical and medullary cells they move to the center of the cell surrounding the nucleus. After some days of darkness the chromatophores of the epidermal cells occupy the inner periclinal and 2/3 of the anticlinal cell walls. In the cortical and medullary cells they are evenly distributed in the cytoplasmic layer at the wall. Obviously, the transmission changes measured are mainly due to chromatophore displacements in the cortical cells. Changes in shape and size play a minor role.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02189486
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    Paper (German National Licenses)
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